VP9 on-fly spatial resolution change support

[Srinivas Eregala]

Dear all,

 

This is regarding spatial resolution change for non-key frames.

Is there any limit on resolution change in VP9 specification?

In experimental code, we could able to find restriction on resolution change in height 

( "assert(y_step_q4 <= 32)")

But we could n't find any restriction on width.

 

Thanks and Regards,

Srinivas Reddy E.

[John Koleszar]

Hi,

Height and width are restricted in the same way. You can't predict
from a frame that's more than 2x the size of the current frame in
either dimension. This corresponds to a maximum x_step_q4 and
y_step_q4 of 32.

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